Demon School

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"Professor Lu brought the latest design plan for recyclable rockets, you all come to see it!" Liu Xiaoxiao stepped back a little and gave the computer screen to them, "According to my preliminary judgment, this plan is in It is theoretically very feasible! You also analyze it! "

"This is something that can be analyzed in a moment!" Someone mumbled like this, but he still bent down and stared at the monitor closely.

The space in front of the computer is so large, the display screen is too small, and the back several people have stretched their necks and saw nothing, they ca n’t help but protest, “I said Mr. Liu, do n’t you have a projector here? Take Use it! "

"Oh, yes, yes! I forgot this when I was excited!" Liu Daxiao slapped his head, smiled embarrassedly, and quickly took out the projector to connect, and others quickly stepped forward to help, and after a while, clearly The big picture appeared on the projection screen of the office wall.

Well, the big picture looks cool! Everyone found a place to sit and looked closely. Liu Daxiao returned to his computer and took out a laser pointer to start the commentary. "Professor Lu ’s design idea is to equip the first-level rocket with 9 engines, the first-level rocket and the second-level rocket. When returning after separation, you can ignite only 3 of them. When you want to decelerate before landing, you may need only 1 engine. The combination of multiple engines can be used to achieve the recovery of the first-level rocket! Solved the problem that the previous large thrust engine could not accurately control the thrust. At the same time, there are 4 expandable wings on the arrow body, which is used to assist the satellite to guide the control of the rocket to the predetermined location, so that the final landing accuracy is 8 Within meters, this accuracy is much stronger than the parachute plan we made before ..... "

"This method can ensure the stability of the rocket after the separation of the first and second stages?" Some people listened and asked their own questions. The biggest difficulty of the recoverable rocket is here. When the first-stage rocket returns to the atmosphere, It must remain vertical. If it rolls into the atmosphere, the rocket will suffer too much resistance because of its own resistance, and there will be intense friction with the atmosphere. Very likely to cause an explosion.

It is difficult to imagine the difficulty of keeping the slender rocket body vertical to the ground. The aerospace community uses this sentence to describe this difficulty: "Let the broom handle stand upright on the palm of the wind"; To reach this standard, unless this broom is Harry Potter's "Firebolt"!

"For this problem. Professor Lu has given the solution below!" Liu Daxiao switched to the next picture and used a laser pointer to draw circles on the picture. "In the return process, the first stage rocket passed The liquid nitrogen thruster on the arrow adjusts its attitude to deal with the effects of aerodynamic torque and rotation. It has almost no roll, and it is always ideal to maintain verticality with the ground during the landing process; aerodynamic torque is also given next to this And the calculation formula of rotation, according to my rough calculation, this design can completely achieve the goal. "

"I'll figure it out! If the weight of the first-level rocket is ... the length is 42.6 meters, the diameter is ... the speed of returning to the atmosphere is ..." Someone immediately started his own calculation based on the formula proposed by Lu Qiujian He closed his eyes and thought about it in his mind, then he opened his eyes violently, "I substituted the data of a certain type of rocket for calculation, and the result was completely in line with Professor Lu's plan! It seems this thing is really useful. ! "

"Is three engines enough to make the rocket slow down successfully?" Another person asked the second question.

"The first restart aims to reduce the landing speed of the first-stage rocket so that it can land to the scheduled recovery location; when the first-stage rocket comes over the predetermined location. Then restart its other engine to further slow down. Eventually To reduce the speed of the rocket from the initial 1300 meters / second to 2 meters / second. In addition, before the first stage rocket approaches the landing site, the four landing brackets installed at the bottom of the rocket must be opened, which has hydraulic shock absorbers , Can further reduce the huge impact of vertical landing, thereby weakening the impact of the landing impulse on the rocket body and achieve a soft landing! "Liu Daxiao took out a new picture to explain this problem.

There is a detailed calculation formula next to the picture as before. The person who asked the question made a calculation based on their own experience. The result is exactly the same as before. This design can make the rocket successfully achieve a soft landing.

After all the design drawings are read, the aerospace experts here have reached the apex of the plan's conviction, and can't wait to start making experimental rockets immediately.

"If Prof. Lu's scheme is tested successfully! Then our rocket launch cost will be greatly reduced!" Liu Daxiao said excitedly, the cost of space launch is very high. This cost mainly includes the development cost of the launch vehicle, the launch cost of the launch vehicle, the measurement and control cost of the launch vehicle and so on.

The launch cost of the Saturn V rocket used by the United States to land on the moon is 185 million US dollars. The long march of China 3be is priced at about 400 million yuan. Humans want to send a kilogram of material to space, it will cost about 10,000 to 20,000 US dollars ~ www.wuxiaspot.com ~ Take the Long March 3be as an example. The biggest weight of the rocket is 400 tons of fuel. Among them, unsymmetrical dimethylhydrazine, about 251,000 tons, liquid hydrogen is about 100,000, other liquid oxygen and nitrous oxide are about 10,000, the total price of the rocket fuel is about 60 million yuan.

The remaining launch site, measurement, control and transportation costs are not very high. The remaining 300 million yuan is spent on the rocket body, engine, etc., and the cost of the first-level rocket is the highest.

If the first-level rocket can be recycled, then only need to continue to pour fuel for the next launch, and then add the second and third-stage rocket body! This can save at least 70% of the launch cost, and the launch price of Long March 3be will immediately drop to 120 million! This still includes the cost of increasing the engine and fuel!

Of course, this is certainly not the case for doing business. University Liu will never sell the rocket and sell it for cabbage in one go! But even if it drops to 250 million yuan, the global low-end satellite launch market will be completely monopolized by them! One can imagine the profit.

For example, it used to be a match to launch a rocket before. It is useless to light this match once! But now it's like using a lighter, and the oil in the lighter is gone and you can just add it! Even if the price of the lighter is a little more expensive than the match, they will gladly accept it!

[I'm going to 515 soon, I hope to continue to impact the 515 red envelope list. By May 15th, the red envelope rain can give back to readers and publicity works. One piece is also love, definitely better! 】 (To be continued.)